Seagrass can easily be confused with marine macroalgae, or
seaweed, but there are many important differences between the two.
While seagrasses are considered vascular plants, seaweed are
protists (a taxonomic group that includes protozoans, prokaryotes,
fungi, sponges, and algae). The two also differ in reproduction,
structure, and the methods by which they transport nutrients and
dissolved gases. The table and diagram below illustrate some of
these distinctions.